Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2028,4,Mod(337,2028)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2028, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("2028.337");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2028 = 2^{2} \cdot 3 \cdot 13^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2028.b (of order \(2\), degree \(1\), not minimal) |
Newform invariants
comment: select newform
sage: f = N[0] # Warning: the index may be different
gp: f = lf[1] \\ Warning: the index may be different
| Self dual: | no |
| Analytic conductor: | \(119.655873492\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-1}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 156) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of \(\beta = 2i\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/2028\mathbb{Z}\right)^\times\).
| \(n\) | \(677\) | \(1015\) | \(1861\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-1\) |
Embeddings
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
comment: embeddings in the coefficient field
gp: mfembed(f)
| Label | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 337.1 |
|
0 | 3.00000 | 0 | − | 2.00000i | 0 | 32.0000i | 0 | 9.00000 | 0 | |||||||||||||||||||||||
| 337.2 | 0 | 3.00000 | 0 | 2.00000i | 0 | − | 32.0000i | 0 | 9.00000 | 0 | ||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 13.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 2028.4.b.d | 2 | |
| 13.b | even | 2 | 1 | inner | 2028.4.b.d | 2 | |
| 13.d | odd | 4 | 1 | 156.4.a.b | ✓ | 1 | |
| 13.d | odd | 4 | 1 | 2028.4.a.b | 1 | ||
| 39.f | even | 4 | 1 | 468.4.a.a | 1 | ||
| 52.f | even | 4 | 1 | 624.4.a.b | 1 | ||
| 104.j | odd | 4 | 1 | 2496.4.a.d | 1 | ||
| 104.m | even | 4 | 1 | 2496.4.a.m | 1 | ||
| 156.l | odd | 4 | 1 | 1872.4.a.i | 1 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 156.4.a.b | ✓ | 1 | 13.d | odd | 4 | 1 | |
| 468.4.a.a | 1 | 39.f | even | 4 | 1 | ||
| 624.4.a.b | 1 | 52.f | even | 4 | 1 | ||
| 1872.4.a.i | 1 | 156.l | odd | 4 | 1 | ||
| 2028.4.a.b | 1 | 13.d | odd | 4 | 1 | ||
| 2028.4.b.d | 2 | 1.a | even | 1 | 1 | trivial | |
| 2028.4.b.d | 2 | 13.b | even | 2 | 1 | inner | |
| 2496.4.a.d | 1 | 104.j | odd | 4 | 1 | ||
| 2496.4.a.m | 1 | 104.m | even | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{2} + 4 \)
acting on \(S_{4}^{\mathrm{new}}(2028, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( (T - 3)^{2} \)
|
| $5$ |
\( T^{2} + 4 \)
|
| $7$ |
\( T^{2} + 1024 \)
|
| $11$ |
\( T^{2} + 4624 \)
|
| $13$ |
\( T^{2} \)
|
| $17$ |
\( (T - 14)^{2} \)
|
| $19$ |
\( T^{2} + 16 \)
|
| $23$ |
\( (T + 72)^{2} \)
|
| $29$ |
\( (T - 102)^{2} \)
|
| $31$ |
\( T^{2} + 18496 \)
|
| $37$ |
\( T^{2} + 148996 \)
|
| $41$ |
\( T^{2} + 62500 \)
|
| $43$ |
\( (T - 140)^{2} \)
|
| $47$ |
\( T^{2} + 87616 \)
|
| $53$ |
\( (T - 526)^{2} \)
|
| $59$ |
\( T^{2} + 110224 \)
|
| $61$ |
\( (T + 410)^{2} \)
|
| $67$ |
\( T^{2} + 355216 \)
|
| $71$ |
\( T^{2} + 774400 \)
|
| $73$ |
\( T^{2} + 256036 \)
|
| $79$ |
\( (T + 640)^{2} \)
|
| $83$ |
\( T^{2} + 1904400 \)
|
| $89$ |
\( T^{2} + 2102500 \)
|
| $97$ |
\( T^{2} + 198916 \)
|
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